Why Were the People of Botswana Spared the Agonies of Later

Why were the people of Botswana spared the agonies of later apartheid in South Africa?

A) Because of the deal they made with France
B) Because of their effort and skill in diplomatic meetings with government officials in London in 1895
C) Because their military skills overwhelmed the British
D) Because they succeeded in uniting other peoples in their fight against the British
E) Because Botswana had no resources that were of interest to the British